{"product_id":"tru-time-mainspring-elgin-5550-for-15-0s-movements-steel","title":"Tru-Time Mainspring - Elgin 5550 for 15\/0s movements - Steel","description":"\u003cp\u003e\u003cstrong\u003eTru-Time\u003c\/strong\u003e Mainspring for \u003cstrong\u003eElgin\u003c\/strong\u003e 15\/0s movements, Factory No. 5550, steel, new in possibly frail envelope. 15\/0s are usually grades 536, 537, 538, 557, 558, 559, 623, 624 \u0026amp; 626.  See images for precise mainspring specifications. I specialize in hard to find watch parts and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.\u003c\/p\u003e","brand":"Tru-Time","offers":[{"title":"Default Title","offer_id":49195831001396,"sku":"PMA-TRU5550S-07","price":2.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/files\/2026-07-2016.10.07.jpg?v=1784589137","url":"https:\/\/www.vintagetimeparts.com\/products\/tru-time-mainspring-elgin-5550-for-15-0s-movements-steel","provider":"Vintage Time Parts","version":"1.0","type":"link"}